No neutral switch for EPH heating valve managment (2 wire thermostat replacement) to Sonoff ZBMINIL2


I have Heat pump at my home and three mechanical thermostats EPH-CM2 (CM - Room Thermostat - EPH Controls). Those are 2 wires thermostats with live 220v. Those thermostats manage EPH V221P 2 Port Valve (2 Port Valve - Compression - EPH Controls).

I have an idea to replace (or add) there Sonoff ZBMINIL2 and external thermometers to switch heating on and off.

My question about wiring and how safe that solution will be? Do I need to add extra fuses there or better to find another solution?

Thanks in advance!